Schema to json

[rcjackson]

This adds functionality to BatchSchema to dump the properties of a BatchSchema to a json file. All you do is, for a given BatchSchema bs, do

json_str = bs.to_json() 

to have the JSON representation in a string.

To put the JSON representation in a file, do:

bs.to_file('file.json')

Fixes #155

[codecov-commenter]

Codecov Report

Merging #159 (c43d917) into main (963a8d3) will increase coverage by 1.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
+ Coverage   96.04%   97.44%   +1.39%     
==========================================
  Files           6        6              
  Lines         329      352      +23     
  Branches       70       74       +4     
==========================================
+ Hits          316      343      +27     
+ Misses          8        6       -2     
+ Partials        5        3       -2     

Impacted Files	Coverage Δ
xbatcher/generators.py	97.39% <100.00%> (+2.72%)	⬆️

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